无法使用数据库的不同记录进行搜索

我是新来的，已经在这里工作了很长时间，我无法解决问题。我的ShowAllView控制器中有以下代码：

 public ActionResult Index(string Ordering, string WordFilter, string DisplaySearchResults, int? CounterForPage)
        {
            using (var db = new gamezoneDBEntities())
            {
                ViewBag.Message = TempData["message"];
                ViewBag.CurrentSort = Ordering;
                ViewBag.NameSortParm = String.IsNullOrEmpty(Ordering) ? "GameName" : "";
                ViewBag.DateSortParm = Ordering == "ReleaseYearOfGame" ? "DiscriptionOfGame" : "Date";

                {
                    TempData["DisplaySearchResult"] = DisplaySearchResults;
                    {
                        ViewBag.search = DisplaySearchResults;
                    }
                    if (Request.HttpMethod == "GET")
                    {
                        DisplaySearchResults = WordFilter;
                    }
                    else if (DisplaySearchResults == "")
                    {
                        ViewData["MyMessage"] = "Nothing Has Been Entered.";
                    }
                    else
                    {
                        CounterForPage = 1;
                    }
                    ViewBag.CurrentFilter = DisplaySearchResults;

                    var FullDatabaseItem = from b in db.tblReviews.Include(x => x.tblGame)
                                           select b;

                    if (!String.IsNullOrEmpty(DisplaySearchResults))
                    {
                        FullDatabaseItem = FullDatabaseItem.Include (x => x.tblGame)
                       .Where (b => b.Score.ToUpper().Contains(DisplaySearchResults.ToUpper()));
                    }
                    switch (Ordering)
                    {
                        case "HeadlineName":
                            FullDatabaseItem = FullDatabaseItem.OrderBy(b => b.Score);
                            break;
                        case "DatePosted":
                            FullDatabaseItem = FullDatabaseItem.OrderBy(b => b.Recomendation);
                            break;
                        case "DiscriptionDate":
                            FullDatabaseItem = FullDatabaseItem.OrderBy(b => b.Recomendation);
                            break;
                        default:
                            FullDatabaseItem = FullDatabaseItem.OrderByDescending(b => b.Recomendation);
                            break;
                    }
                    int pageSize = 3;
                    int pageNumber = (CounterForPage ?? 1);
                    var PageNumberResults = FullDatabaseItem.ToPagedList(pageNumber, pageSize);
                    ViewBag.PageNumberResults = FullDatabaseItem.Count();
                    if (PageNumberResults.Any())
                    {
                        return View(PageNumberResults);
                    }
                    return View("ErrorView");
                }
            }
        }

如您所见，我添加了以下代码：

var FullDatabaseItem = from b in db.tblReviews.Include(x => x.tblGame)select b;

如果不在评论表中包含，视图将引发以下错误：

The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.

现在问题出在这行代码上：

FullDatabaseItem = FullDatabaseItem.Include (x => x.tblGame)
                        .Where (b => b.Score.ToUpper().Contains(DisplaySearchResults.ToUpper()));

我试图获取游戏名称，以便当用户使用我的搜索时，他只需输入游戏名称即可获得记录购买。但是正如您所看到的，正在搜索的字段是"Score"这是tblReview字段，因为我需要的字段"GameName"在那里不起作用，因为它说它不存在。

我需要帮助来解决问题

您需要更多信息，请问我，我将提供

谢谢

public class tblReview
{
    public virtual tblGame tblGame { get; set; }
    // other properties
}

public class tblGame
{
    public virtual ICollection<tblReview> tblReviews { get; set; }
    // other properties
}

string gameName = "Pac-Man";
using (var db = new gamezoneDBEntities())
{
    // get reviews for game named pac-man
    var reviews = db.tblReviews.Include(r => r.tblGame)
        .Where(r => r.tblGame.GameName.Equals(gameName, 
            StringComparison.OrdinalIgnoreCase));
    // get game with reviews scored greater than 4
    var games = db.tblGames.Include(g => g.tblReviews)
        .Where(g => g.tblReviews.Any(r => r.Score > 4));
}

var FullDatabaseItem = db.tblReviews.Include(g => g.tblGame);
if (!string.IsNullOrEmpty(DisplaySearchResults))
{
    FullDatabaseItem = FullDatabaseItem
        .Where(review => review.tblGame.GameName.Contains(DisplaySearchResults));
}